from datetime import datetime
from urllib.parse import urlparse

from flask import render_template, redirect, url_for, flash, request
from flask_login import current_user, login_user, logout_user, login_required

from app import app, db
from app.forms import *
from app.models import User, Post


@app.before_request
def before_request():
    if current_user.is_authenticated:
        current_user.last_seen = datetime.utcnow()
        db.session.commit()
@app.route('/',methods=['GET', 'POST'])
@app.route('/index',methods=['GET', 'POST'])
@login_required
def index():
    form = PostForm()
    if form.validate_on_submit():
        post = Post(body=form.post.data, author=current_user)
        db.session.add(post)
        db.session.commit()
        flash('Your post is now live!')
        return redirect(url_for('index'))
    posts=current_user.followed_posts().all()
    return render_template("index.html", title='Home Page', form=form,
                           posts=posts)

@app.route('/login', methods=['GET', 'POST'])
def login():
    if current_user.is_authenticated:
        return redirect(url_for('index'))
    form = LoginForm()
    if form.validate_on_submit():
        user = User.query.filter_by(username=form.username.data).first()
        if user is None or not user.check_password(form.password.data):
            flash('Invalid username or password')
            return redirect(url_for('login'))
        login_user(user, remember=form.remember_me.data)
        next_page = request.args.get('next')
        if not next_page or urlparse(next_page).netloc != '':
            next_page = url_for('index')
        return redirect(next_page)
    # 添加调试信息
    else:
        print("Form not validated")
        print(form.errors)
    return render_template('login.html', title='Login', form=form)

@app.route('/logout')
def logout():
    logout_user()
    return redirect(url_for('index'))

@app.route('/register', methods=['GET', 'POST'])
def register():
    if current_user.is_authenticated:
        return redirect(url_for('index'))
    form = RegistrationForm()
    if form.validate_on_submit():
        user = User(username=form.username.data, email=form.email.data)
        user.set_password(form.password.data)
        db.session.add(user)
        db.session.commit()
        flash('Congratulations, you are now a registered user!')
        return redirect(url_for('login'))
    return render_template('register.html', title='Register', form=form)

@app.route('/user/<username>', methods=['GET'])
@login_required
def user(username):
    user = User.query.filter_by(username=username).first_or_404()
    posts = user.posts.order_by(Post.timestamp.desc()).all()
    followers_count = user.followers_count()
    followed_count = user.followed_count()
    return render_template('user.html', user=user, posts=posts, followers_count=followers_count,
                           followed_count=followed_count)

@app.route('/edit_profile',methods=['GET','POST'])
@login_required
def edit_profile():
    form = EditProfileForm()
    if form.validate_on_submit():
        current_user.username = form.username.data
        current_user.about_me = form.about_me.data
        db.session.commit()

        flash('Your changes have been saved.')
        return redirect(url_for('edit_profile'))
    elif request.method == 'GET':
        form.username.data = current_user.username
        form.about_me.data= current_user.about_me
    return render_template('edit_profile.html', title='Edit Profile', form=form)



@app.route('/follow/<username>')
@login_required
def follow(username):
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash(f'用户 {username} 未找到。')
        return redirect(url_for('index'))
    if user == current_user:
        flash('你不能关注自己！')
        return redirect(url_for('user', username=username))
    current_user.follow(user)
    db.session.commit()
    flash(f'你已关注 {username}！')
    return redirect(url_for('user', username=username))

@app.route('/unfollow/<username>')
@login_required
def unfollow(username):
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash(f'用户 {username} 未找到。')
        return redirect(url_for('index'))
    if user == current_user:
        flash('你不能取消关注自己！')
        return redirect(url_for('user', username=username))
    current_user.unfollow(user)
    db.session.commit()
    flash(f'你已取消关注 {username}。')
    return redirect(url_for('user', username=username))
